Novak Djokovic, Coco Gauff roll to Australian Open's 4th round. Naomi Osaka retires due to injury and Jessica Pegula was upset in the third round.

Novak Djokovic has overcome some trouble breathing and played quite well for a straight-set victory over 26th-seeded Tomas Machac to reach the fourth round at the Australian Open.

Blowing kisses to the booing fans, Danielle Collins caused a storm during her match 😅 Now, Djokovic has weighed in on the controversy 👀

The 24-time Grand Slam champion is a master of easing into majors. At every one, he has a match that lifts him up. Will this one be it?

Count Novak Djokovic as being in Danielle Collins’ corner. He thinks her response to booing fans at the Australian Open was absolutely fine — which should come as no surprise, given the way Djokovic gets into back-and-forths with hecklers at his matches,

Novak Djokovic sought assistance from a trainer for some trouble breathing Friday night, and went back-and-forth with one particularly loud spectator, but when the ball was in play at the Australian Open against Tomas Machac,

Novak Djokovic was in a jovial mood after booking his spot in the fourth round of the Australian Open - even offering to take a fan out for a drink as his wife Jelena laughed

Novak Djokovic called out a drunk Australian Open heckler following his 6-1 6-4 6-4 win over Tomas Machac in the third round on Friday. Djokovic cruised past the 26th-seed Czech star in straight sets to set up a fourth-round showdown with 24th-seed Jiri Lehecka at Melbourne Park.

Novak Djokovic has revealed he's 'very hot-headed' in the wake of his victory over Tomas Machac at the Australian Open on Friday morning. The Serb won 6-1, 6-4, 6-4 to book his place in the fourth round of the competition as he continues to chase Grand Slam No 25.